/* ===================================================================
   岁时 · Seasonal — 官网样式
   配色取自 App 内置主题「纸上四时」（浅色）与「玄青夜色」（深色）
   =================================================================== */

:root {
  --paper: #f7f3ea;
  --paper-raised: #fbf8f1;
  --ink: #1d211e;
  --ink-2: #62665e;
  --green: #49614e;
  --green-soft: #dde2d7;
  --cinnabar: #b83a2a;
  --divider: rgba(29, 33, 30, 0.14);
  --shadow: 0 32px 80px -32px rgba(29, 33, 30, 0.38);
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong",
    "SimSun", "Times New Roman", serif;
  --sans: -apple-system, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #18231f;
    --paper-raised: #22312b;
    --ink: #f0ebdd;
    --ink-2: #b7c0b5;
    --green: #a8c1a8;
    --green-soft: #34483c;
    --cinnabar: #e07a66;
    --divider: rgba(255, 255, 255, 0.14);
    --shadow: 0 32px 80px -32px rgba(0, 0, 0, 0.75);
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  /* 宣纸质感：极淡的噪点纹理 */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0.4 0 0 0 0 0.38 0 0 0 0 0.33 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
}

a {
  color: var(--green);
  text-decoration: none;
}

a:hover {
  color: var(--cinnabar);
}

img {
  max-width: 100%;
  display: block;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- 顶部导航 ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--paper) 84%, transparent);
  border-bottom: 1px solid var(--divider);
}

.site-nav .container {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 21px;
  letter-spacing: 0.4em;
  color: var(--ink);
  font-weight: 600;
}

.brand:hover {
  color: var(--ink);
}

.seal {
  width: 27px;
  height: 27px;
  border-radius: 5px;
  background: var(--cinnabar);
  color: #fbf8f1;
  font-size: 15px;
  line-height: 27px;
  text-align: center;
  letter-spacing: 0;
  flex: none;
}

.site-nav .links {
  display: flex;
  gap: 32px;
  margin-left: auto;
  font-family: var(--sans);
  font-size: 14px;
  letter-spacing: 0.12em;
}

.site-nav .links a {
  color: var(--ink-2);
}

.site-nav .links a:hover {
  color: var(--cinnabar);
}

@media (max-width: 640px) {
  .site-nav .links {
    gap: 18px;
  }
  .site-nav .links a.hide-sm {
    display: none;
  }
}

/* ---------- Hero：满屏留白 ---------- */

.hero {
  min-height: calc(100svh - 68px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding: 72px 24px;
}

.hero-ornament {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  white-space: nowrap;
  font-size: 13px;
  letter-spacing: 0.72em;
  line-height: 1;
  color: var(--ink-2);
  opacity: 0.6;
  user-select: none;
}

.hero-ornament.left {
  left: clamp(24px, 6vw, 88px);
}

.hero-ornament.right {
  right: clamp(24px, 6vw, 88px);
}

@media (max-width: 960px) {
  .hero-ornament {
    display: none;
  }
}

.hero-eyebrow {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.62em;
  text-indent: 0.62em;
  color: var(--cinnabar);
  margin-bottom: clamp(28px, 5vh, 48px);
}

.hero h1 {
  font-size: clamp(68px, 13vw, 132px);
  font-weight: 600;
  letter-spacing: 0.28em;
  text-indent: 0.28em;
  line-height: 1.15;
  position: relative;
  display: inline-block;
}

.hero-seal {
  position: absolute;
  right: -0.12em;
  bottom: 0.08em;
  writing-mode: vertical-rl;
  font-size: clamp(13px, 1.6vw, 17px);
  line-height: 1.15;
  letter-spacing: 0.14em;
  text-indent: 0;
  background: var(--cinnabar);
  color: #fbf8f1;
  padding: 0.5em 0.28em;
  border-radius: 4px;
  font-weight: 500;
}

.hero .tagline {
  font-size: clamp(19px, 3vw, 27px);
  letter-spacing: 0.42em;
  text-indent: 0.42em;
  margin-top: clamp(32px, 6vh, 56px);
}

.hero-rule {
  width: 1px;
  height: clamp(36px, 6vh, 60px);
  background: color-mix(in srgb, var(--ink) 32%, transparent);
  margin: clamp(28px, 5vh, 44px) auto;
}

.hero .sub {
  font-family: var(--sans);
  color: var(--ink-2);
  font-size: 15.5px;
  letter-spacing: 0.06em;
  max-width: 620px;
  margin: 0 auto;
}

.hero .avail {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--ink-2);
  opacity: 0.85;
  margin-top: clamp(28px, 5vh, 44px);
}

/* ---------- 产品截图 ---------- */

.shot-section {
  padding: 0 0 104px;
}

.window-frame {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--divider);
  box-shadow: var(--shadow);
  background: var(--paper-raised);
}

/* ---------- 二十四节气条幅 ---------- */

.terms-strip {
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
  padding: 26px 32px;
  text-align: center;
  font-size: 13px;
  letter-spacing: 0.3em;
  line-height: 2.6;
  color: var(--ink-2);
}

.terms-strip i {
  font-style: normal;
  color: var(--cinnabar);
  padding: 0 0.9em;
  opacity: 0.7;
}

/* ---------- 章节通用 ---------- */

section {
  padding: 120px 0;
}

.section-head {
  margin-bottom: 72px;
}

.section-head.center {
  text-align: center;
}

.section-kicker {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.6em;
  color: var(--cinnabar);
  margin-bottom: 20px;
}

.section-head.center .section-kicker {
  text-indent: 0.6em;
}

.section-title {
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.section-lede {
  color: var(--ink-2);
  font-family: var(--sans);
  font-size: 15.5px;
  letter-spacing: 0.04em;
  max-width: 640px;
}

.section-head.center .section-lede {
  margin: 0 auto;
}

/* ---------- 功能：编辑式排版 ---------- */

.feature-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  column-gap: 56px;
}

@media (max-width: 900px) {
  .feature-list {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 40px;
  }
}

@media (max-width: 600px) {
  .feature-list {
    grid-template-columns: 1fr;
  }
}

.feature {
  border-top: 1px solid var(--divider);
  padding: 30px 0 44px;
}

.feature .fnum {
  display: block;
  font-size: 13px;
  letter-spacing: 0.4em;
  color: var(--cinnabar);
  margin-bottom: 20px;
}

.feature h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.feature p {
  font-family: var(--sans);
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.9;
}

/* ---------- 小组件：清单排版 ---------- */

.widget-rows {
  border-top: 1px solid var(--divider);
  margin-bottom: 88px;
}

.widget-row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 8px 40px;
  padding: 26px 0;
  border-bottom: 1px solid var(--divider);
  align-items: baseline;
}

@media (max-width: 640px) {
  .widget-row {
    grid-template-columns: 1fr;
  }
}

.widget-row b {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.widget-row span {
  font-family: var(--sans);
  font-size: 14.5px;
  color: var(--ink-2);
}

/* ---------- 隐私：宣言式 ---------- */

.privacy-state {
  text-align: center;
}

.privacy-state .statement {
  font-size: clamp(28px, 5vw, 46px);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-indent: 0.18em;
  margin-bottom: 28px;
}

.privacy-state .state-sub {
  font-family: var(--sans);
  font-size: 15.5px;
  color: var(--ink-2);
  max-width: 560px;
  margin: 0 auto;
}

.privacy-points-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 36px;
  margin-top: 72px;
  text-align: left;
}

@media (max-width: 900px) {
  .privacy-points-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .privacy-points-row {
    grid-template-columns: 1fr;
  }
}

.pp {
  border-top: 1px solid var(--divider);
  padding-top: 20px;
}

.pp b {
  display: block;
  font-size: 16.5px;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.pp p {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.85;
}

.text-link {
  display: inline-block;
  margin-top: 56px;
  font-family: var(--sans);
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
  border-bottom: 1px dashed color-mix(in srgb, var(--cinnabar) 55%, transparent);
  padding-bottom: 2px;
}

.text-link:hover {
  color: var(--cinnabar);
  border-bottom-style: solid;
}

/* ---------- 支持 ---------- */

.support-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 56px;
}

@media (max-width: 720px) {
  .support-grid {
    grid-template-columns: 1fr;
  }
}

.support-card {
  border-top: 1px solid var(--divider);
  padding: 30px 0 44px;
}

.support-card h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.support-card p {
  font-family: var(--sans);
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 2;
}

.support-card .mail {
  display: inline-block;
  margin-top: 18px;
  font-family: var(--sans);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--cinnabar);
  border-bottom: 1px dashed color-mix(in srgb, var(--cinnabar) 55%, transparent);
  padding-bottom: 2px;
}

/* ---------- 页脚 ---------- */

footer {
  border-top: 1px solid var(--divider);
  padding: 52px 0 64px;
  font-family: var(--sans);
  font-size: 13.5px;
  letter-spacing: 0.06em;
  color: var(--ink-2);
}

footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 32px;
  align-items: center;
  justify-content: space-between;
}

footer .foot-links {
  display: flex;
  gap: 24px;
}

footer a {
  color: var(--ink-2);
}

footer a:hover {
  color: var(--cinnabar);
}

/* ---------- 文档页（隐私政策） ---------- */

.doc {
  max-width: 760px;
  margin: 0 auto;
  padding: 80px 24px 104px;
}

.doc h1 {
  font-size: clamp(30px, 5vw, 40px);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

.doc .doc-meta {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-2);
  margin-bottom: 44px;
}

.doc h2 {
  font-size: 21px;
  letter-spacing: 0.06em;
  margin: 48px 0 14px;
  padding-top: 30px;
  border-top: 1px solid var(--divider);
}

.doc p,
.doc li {
  font-family: var(--sans);
  font-size: 15.5px;
  color: color-mix(in srgb, var(--ink) 88%, var(--ink-2));
}

.doc ul {
  padding-left: 22px;
  display: grid;
  gap: 8px;
  margin: 12px 0;
}

.doc strong {
  color: var(--ink);
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 14.5px;
  margin: 18px 0;
}

.doc th,
.doc td {
  text-align: left;
  padding: 12px 14px;
  border: 1px solid var(--divider);
  vertical-align: top;
}

.doc th {
  background: var(--green-soft);
  font-weight: 600;
  white-space: nowrap;
}

.doc .table-wrap {
  overflow-x: auto;
}

.doc .callout {
  background: var(--green-soft);
  border-radius: 12px;
  padding: 18px 22px;
  margin: 18px 0;
}